Specific i2s cable for use with Sonnet Morpheus DAC & 3rd party DDC

In my specific case I already have a high quality streamer (Antipodes CX/EX) which outputs signal via USB. Thus I don't see the need for the Sonnet Hermes.

The following is direct from the Sonnet website:

List with compatible devices when a custom cable is used:

Aqua LaScala MK2 Optologic DAC

Jay’s Audio CDT3

Denafrips Terminator

Denafrips Avatar

Denafrips Hermes Digital to Digital Converter

A further read on the Sonnet website deals with "Pin configuration" on the i2s cable. Perhaps I am misunderstanding the info on Sonnet webpage but it seems like one needs a custom configured i2s cable when taking the output of a 3rd party (ie. NON-Sonnet) product like the Denafrips Hermes.

The author of the Stereophile review also states that he needed a "custom i2s cable" to connect a 3rd party DDC to the Morpheus i2s input. I quote him here:

I reached out to Rob Fritz of Audio Art Cable, the Sonnet retailer who'd sent me the review samples. One of his customers uses a Denafrips Iris with his Morpheus and connects them with a cable from Phasure Audio, another Dutch company, which provides cables with customizable pinouts.

I'd certainly prefer that an off the shelf i2s cable taking the digital output of say a Denafrips Hermes can work with the Morpheus, but I'd rather know the facts before I purchase. 

You are correct to want to find out exact I2s configuration of both. You need to find out from manufacturers themselves. As an example the configuration of the Jay's cdt2-mk3 and Gustard x26 pro  are identical while the PS Audio CD transport is not and thus will not work. My experience. Look at details of the Gustard X26 PRO and you will see what a I2s configuration looks like. 

It's at the very bottom of the shenzenaudio gustard x26 pro specifications page.